Spring-actuated hammer.



E. L. UPSON & H. W. P-LEISTER.

SPRING ACTUATED HAMMER.

APPLICATION HLED MAY15. 1914.

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SPRING ACTUATED HAMMER.

APPLICATION FILED MAYI5. 1914.

Patented Dec. 14, 1915.

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ED'WIN L. UPSON, OF BROOKLYN. NEW YORK, AND HENRY W. PLEISTER, 0F WEST- FIELD, NEW JERSEY, ASSIGNORS TO H HAMPSHIRE.

ENRE' B. NEWHALL, OF LITTLETON, NEW

SEEING-ACTUATED HAMMER.

Application ledMay 15, 1914.

To @ZZ Lv/tom it may concern Be it known that we, EnwrN L. UrsoN, a citizen of the United States, residing at Brooklyn, in the county of Kings and `State of New York, and HENRY lV. PLEIs'rnR, a citizen of the United States, residing at lVestiield, in4 the county of Union and State of New Jersey, have invented certain new and useful Improvements in` Spring-Actuated Hammers, of which the following is a specification.

Our present invention relates to hammers of the type disclosed in the Upson- Pleister application, Serial No. 719,735 and more especially to a-n improved mode of stcring energy for operating, and delivering it to, the percussion member; and also to an improved mode of guiding and reducing the friction of said member.

1n the drawings, Figure 1 and Fig. 2 illustrate the preferred form of our invention, Fig. 1 being an obverse sectional elevation and Fig. 2 a corresponding axial section; and the remaining figures illustrate variants, Fig. 3 being an axial section, Fig. 4 a sectional obverse and Fig. 5 a reverse elevation of one variant.

As in said application, we provide a substantially cylindrical housing 1 with symmetrically opposite breast-stock and tool-l stcck bosses, 2 and 13 respectively, an axial stud-boss, for a stud 9, a face-plate to close the housing and inclose the working parts (except the hammer-stock), a dial 34, to facilitate adjusting hammer-blows to their uses; on the stud 9 we mount a hammerretracting cam-disk 11 armed with a plurality of cams 12; and in the bore 14 of the boss 13 we locate a hammer-stock 22 having in its face a cam groove 24 with which, when the cam-disk 11 is revolved (by its crank 4:0 or otherwise), the cams 12 successively engage and disengage, to retract the hammer and compress and store energy in the spring 26 and to release the hammer so that it can loe thrown outward by said spring. In said application we illustrate a heart-shaped iexure spring strained between the hammer-stock and a crank pin 2S eccentrically mounted on a suitable stud 31, adapted to be rotated to vary the mean distance between the crank pin 28, and the hammer-stock, and the initial strain in the spring 26 and the force of blows.

In our present invention we embody a Specification of Letters Patent.

Patented Dec. Mi, i915. Serial No. 838,659.

much more efficient and durable energy storage member 260 which comprises a branched stock head 221 fitted on the hammer stock 22, a yoke 263, connected with the adjusting crank pin 2S of the stud 31 (which we still employ), a pair of helical compression springs 26 symmetrically located relatively to the axis, and initially and adjustably strained between the said yoke and swivelhead.

In the preferred type of hammer (Figs. 1 and 2) the guide rods 261 are fixed in suitable bosses provided on the housing 1 and are preferably bolts drawn taut by exterior nuts 265 which are housed in suitable recesses 266, so that the housing adjacent to the breast-stock 2 can be smoothly finished; the springs 26 envelop said rods; the hammer-stock head 221 is bolted by a bolt 222 to the hammer-stock 22 or otherwise made fast thereto and is slidably mounted on the guide reds 261; the blow adjustment yoke 263 is likewise slidably mounted on said rods and engages the adjusting crank pin 28 by means of a slot 264, formed in said yoke; and the springs 26 envelop said rods and are strainedl between said yokes.' In the variant (Figs. 3, 4 and 5) the guide rods 261 are ixed, preferably in the yoke, extend through guide-bores 262 in the other head and are enveloped by said springs.

It is well known that helical springs, which operate bv torsional elasticity. are much more resilient, durable and reliable than springs which operate by bending; and by their substitution we greatly add to the reliability of our hammers and reduce the spring-weight per unit of power stored and delivered.- )Ve further improve the hammer bv simplifying the dial. 3l, by substituting, for the detent-and-ratchet engagement we formerly used to secure in adjusted position the handle 32 of the stud-crank 31-23. the bar-and-slot engagement of the handle 31 with slots 341 formed between lugs proiecting from the housing 1 and bv so locating the dial that axial location of said handle correspondfI with blows of mean force and right and left hand lateral locations respectively (Fig. 3) with minimum and maximum blows` thus making the dial-reading easv and natural.

Ve further improve the hammer bv providing a hammer-guide roller. 380, revoluhly mounted in the housing 1 adjacent to the inner end of the hammer bore 14 and on the cam-recession side, said roller being adapted to guide, support and reduce the friction of motion of the hammer stock 22 when it is retracted by the cams, and supplement, or be used in lieu of, the guide link, 3S, used for the same general purpose in said application and retained in this.

Having thus described our invention, we Claim:-

1. In a hammer of the class described` a housing, a revoluble plural faced cam, a hammer adapted to be engaged and disengaged by successive cam faces of said cam, and a resilient member comprising a pluralitv of helical springs symmetrically located about the axis of the hammer and strained between it and an adjustable abutment on the housing. said abutment comprising a crank revolublv mounted on said housing and a yoke pivotally mounted in said crank.

2. In a hammer of the class described, a

' housing, a revoluble pluralaced cam axiallv mounted therein, a hammer movable radially thereto and adapted to be engaged and disengaged bv successive cam-faces ot said cam, and a resilient member comprising a crank revolublv mounted in said housing, a voke connected with said crank` and a pair of helical springs located to the sides of the hammer axis and strained between said yoke and said hammer.

3. In a hammer of the class described, a housing, a revoluble plural-faced cam mounted therein, an axially movable hammer adapted to be engaged and disengaged by successive cam-faces of said cam, a pair et guide rods fixed in said housing substantially parallel with said hammer, a branched 40 head on said hammer slidably engaging said rods, and a resilient member comprisingr a crank revolubly mounted in said housing,

a yoke slidably mounted onV said rods. and engaging said crank, and a pair ot helical springs enveloping said rods and strained between said yoke and hammer.

4. In a hammer of the class described, a housing, a reroluble plural-faced cam, a hammer adapted to be engaged and disengaged by successive cam faces of said cam,

a resilient member comprising a plurality of helical springs symmetrically located about the axis of the hammer and strained between it and a yoke mounted in saidhousing, and blow adjusting means between said yoke and said housing, said blow adjusting means comprising a stud pivotallv mounted in said housing, a crank pin on said stud to which said yoke is connected, a handle fixed to said stud and disposed on the outside of said housing, and pairs of lugs arranged on the outside of said housing in a circular line equidistant from said stud, each of said pairs of lugs forming a slot into which the handle extends to be secured at any one of its adjustments.

EDWTN L. UPSON. HENRY lV. PLEISTER.

Witnesses as to Upson:

EDWIN G. LEWIS, HARRI'ET BEACH.

Witnesses as to Pleister:

M. R. RYAN,

A. M. WiLLIAMs.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

